I would prefer they not pursue the mother of Wonder Woman angle.
Since the prequel comic is canon, I see no reason why not to use the character; it would allow DC to expand its cinematic mythology, without having all of the pressure on the Superman films.
Justice League (TBD)
Batman: Ben Affleck. Superman: Henry Cavill. Wonder Woman: Gal Gadot. Green Lantern: Tom Anderson.Darkseid: Michael Cera.
Aquaman: Alexander Skarsgard. Martian Manhunter: Liam Neeson. The Flash: Neil Patrick Harris.